West Brom twice came from behind to equalise, with James McClean's late strike earning the visitors a point in a feisty contest where Diego Costa was one of the main protagonists.

There were six bookings in the game and Claudio Yacob was promptly substituted by West Brom boss Tony Pulis after avoiding a second yellow card for an off-the-ball trip on Costa. Courtois felt the change was telling.

"I think he (Yacob) should have been sent off," Courtois said on chelseafc.com.

"Their manager took the player off one second after the foul so I think everybody knows that was clear.

"We're very disappointed. It was a game we wanted to win. It was a tough game with them playing only long balls, (playing for) second balls, trying to provoke players.

"It was a bit frustrating. We tried to do our best, we came back, but sadly they got the second goal."

Chelsea's frustrations - and Costa's in particular - threatened to boil over at full-time, with the Spain striker angrily hitting the perspex tunnel as he left the field.